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Search Publications

NIST Authors in Bold

Displaying 4351 - 4375 of 73823

The impact of the COVID-19 lockdown on greenhouse gases: a multi-city analysis of in situ atmospheric observations

April 27, 2022
Author(s)
Vanessa Monteiro, Natasha Miles, Scott Richardson, Jocelyn Turnbull, Anna Karion, Jooil Kim, Kristal Verhulst, Logan Mitchell, John Lin, Maryann Sargent, Steven Wofsy, Felix Vogel, Kenneth Davis
We tested the capabilities of urban greenhouse gas (GHG) measurement networks to detect abrupt changes in emissions, such as those caused by the roughly 6-week COVID-19 lockdown in March 2020 using hourly in situ GHG mole fraction measurements from six

Two TE market approaches and impact on grid and customer flexibility

April 27, 2022
Author(s)
David Holmberg
This presentation covers simulation research evaluating two approaches to communicating value of electricity to customers. The first communicates day ahead prices to customers and allows customers to purchase forecast load at those prices with actual

Implementing an Equation of State without Derivatives: teqp

April 26, 2022
Author(s)
Ian Bell, Ulrich K. Deiters, Allan Leal
This work uses advanced numerical techniques (complex differentiation and automatic differentiation) to efficiently and accurately compute all the required thermodynamic properties of an equation of state without any analytical derivatives─particularly

Dynamic vapor microextraction of ignitable liquid from casework containers

April 25, 2022
Author(s)
Jennifer Berry, Mary Gregg, Adam Friss, Amanda Koepke, Chris Suiter, Reta Newman, Megan Harries, Kavita Jeerage
Dynamic vapor microextraction (DVME) is a headspace concentration method that can be used to collect ignitable liquid (IL) from fire debris onto chilled adsorbent capillaries. Unlike passive headspace concentration onto activated carbon strips (ACSs) that

Hydrogen Concentration-Induced Stresses in an Environmental TEM

April 25, 2022
Author(s)
Matthew Connolly, Veruska Malave, May Martin
The hydrogen-enhanced localized plasticity (HELP) mechanism is a leading candidate among proposed hydrogen embrittlement (HE) mechanisms. Transmission electron microscopy (TEM) measurements of an increased dislocation mobility on exposure to hydrogen have

Phase retrieval based on deep learning in grating interferometer

April 25, 2022
Author(s)
Ohsung Oh, Youngju Kim, Daeseung Kim, Daniel Hussey, Seung Wook Lee
Grating interferometry is a promising technique to obtain differential phase contrast images with illumination source of low intrinsic transverse coherence. However, retrieving the phase contrast image from the differential phase contrast image is

Photon Efficient Optical Time Transfer

April 24, 2022
Author(s)
Emily Caldwell, Laura Sinclair, William C. Swann, Nathan R. Newbury, Benjamin Stuhl, Jean-Daniel Deschenes
We present a novel frequency comb-based system for optical two-way time-frequency transfer to support very long distance free-space links between clocks. Our Photon-Efficient Agile Comb Optical Clock Synchronization (PEACOCS) system supports sub

Multimodal X-ray Probing of the Capacity Fade Mechanisms of Nickel Rich NMC - Progress and Outlook

April 22, 2022
Author(s)
Cherno Jaye, Daniel A. Fischer, Calvin Quilty, Patrick West, Wenzao Li, Mikaela Dunkin, Garrett Wheeler, Steven Ehrlich, Lu Ma, Esther Takeuchi, Kenneth Takeuchi, David Bock, Amy Marschilok
NMC is a commercially successful Li-ion battery cathode due to its high energy density; however, its delivered capacity must be intentionally limited to achieve capacity retention over extended cycling. To design next-generation NMC batteries with longer

Update of Atomic Data for the First Three Spectra of Actinium

April 22, 2022
Author(s)
Alexander Kramida
Abstract: The present article describes a complete re-analysis of all published data on observed spectral lines and energy levels of the first three spectra of actinium (Ac I–III). In Ac I, three previously determined energy levels have been rejected, 12

Exceptional points in lossy media lead to deep polynomial wave penetration with spatially uniform power loss

April 21, 2022
Author(s)
Alexander Yulaev, Sangsik Kim, Qing Li, Daron Westly, Brian Roxworthy, Kartik Srinivasan, Vladimir Aksyuk
Waves entering a spatially uniform lossy medium typically undergo exponential decay, arising from either the energy loss of the Beer–Lambert–Bouguer transmission law or the evanescent penetration during reflection. Recently, exceptional point singularities

High-fidelity indirect readout of trapped-ion hyperfine qubits

April 21, 2022
Author(s)
Stephen Erickson, Jenny Wu, Panyu Hou, Daniel Cole, Shawn Geller, Alexander Kwiatkowski, Scott Glancy, Emanuel Knill, Daniel Slichter, Andrew C. Wilson, Dietrich Leibfried
We propose and demonstrate a protocol for high-fidelity indirect readout of trapped ion hyperfine qubits, where the state of a 9Be+ qubit ion is mapped to a 25Mg+ readout ion using laser-driven Raman transitions. By partitioning the 9Be+ ground-state

Potentiometric Rotating Ring Disk Electrode (RRDE) Study of Interfacial pH during CO2 Reduction and H2 Generation in Neutral and Weakly Acidic Media

April 21, 2022
Author(s)
Thomas P. Moffat, Nicole Ritzert, David Raciti, Brian Tackett, Nicholas Brady
Electrocatalytic reduction of CO2 to CO in aqueous media offers an important path to more sustainable carbon utilization. Optimization of this process relies on a detailed understanding of the dynamics of boundary layer chemistry, e.g., pH, adjacent to the

Structures and Dynamics of Anionic Lipoprotein Nanodiscs

April 21, 2022
Author(s)
D. Sweeney, Susan T. Krueger, Kakali Sen, John Hackett
Nanolipoprotein particles known as nanodiscs (NDs) have emerged as versatile and powerful tools for the stabilization of mem-brane proteins permitting a plethora of structural and biophysical studies. Part of their allure is their flexibility to

Hardware-Enabled Security: Policy-Based Governance in Trusted Container Platforms

April 20, 2022
Author(s)
Michael Bartock, Murugiah Souppaya, Haidong Xia, Raghu Yeluri, Uttam Shetty, Brandon Lum, Mariusz Sabath, Harmeet Singh, Alaa Youssef, Gosia Steinder, Yu Cao, Jayashree Ramanathan
In today's cloud data centers and edge computing, attack surfaces have significantly increased, cyber attacks are industrialized, and most security control implementations are not coherent or consistent. The foundation of any data center or edge computing

Surveying Practicing Firearm Examiners

April 20, 2022
Author(s)
Nicholas Scurich, Brandon Garrett, Robert M. Thompson
The comparison of discharged bullets and shell casings by firearm examiners is one of the most conducted forensic analyses. However, little is known empirically about how practicing firearm examiners view and conduct their work, the range of conclusions
Displaying 4351 - 4375 of 73823
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